Here is an example shot with both lenses. Note the toaster is in the center of both shots. The one of the left is taken with my EF-S 17-85mm f/4-5.6 ISUSM lens. (Click on the image to see a larger picture.)

You can see how much wider the shot is right away. There is some distortion on the corners of the shot which is unavoidable with such a wide lens.

I can’t wait to give this a shot on some outdoor photography in the summer.